/Engine/Source/Runtime/Engine/Public/WorldPartition/WorldPartition.h
bool IsStreamingCompleted ( EWorldPartitionRuntimeCellState QueryState, const [TArray](API\Runtime\Core\Containers\TArray)< [FWorldPartitionStreamingQuerySource](API\Runtime\Engine\WorldPartition\FWorldPartitionStreamingQuerySou-) > & QuerySources, bool bExactState ) const